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view src/share/vm/oops/cpCacheOop.hpp @ 6408:e5768e936147
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author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Fri, 14 Sep 2012 14:21:33 -0700 |
parents | 1d7922586cf6 |
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/* * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_OOPS_CPCACHEOOP_HPP #define SHARE_VM_OOPS_CPCACHEOOP_HPP #include "interpreter/bytecodes.hpp" #include "memory/allocation.hpp" #include "oops/arrayOop.hpp" #include "utilities/array.hpp" // A ConstantPoolCacheEntry describes an individual entry of the constant // pool cache. There's 2 principal kinds of entries: field entries for in- // stance & static field access, and method entries for invokes. Some of // the entry layout is shared and looks as follows: // // bit number |31 0| // bit length |-8--|-8--|---16----| // -------------------------------- // _indices [ b2 | b1 | index ] index = constant_pool_index (!= 0, normal entries only) // _indices [ index | 00000 ] index = main_entry_index (secondary entries only) // _f1 [ entry specific ] method, klass, or oop (MethodType or CallSite) // _f2 [ entry specific ] vtable index or vfinal method // _flags [tos|0|00|00|00|f|v|f2|unused|field_index] (for field entries) // bit length [ 4 |1|1 |1 | 1|1|1| 1|---5--|----16-----] // _flags [tos|M|vf|fv|ea|f|0|f2|unused|00000|psize] (for method entries) // bit length [ 4 |1|1 |1 | 1|1|1| 1|---5--|--8--|--8--] // -------------------------------- // // with: // index = original constant pool index // b1 = bytecode 1 // b2 = bytecode 2 // psize = parameters size (method entries only) // field_index = index into field information in holder instanceKlass // The index max is 0xffff (max number of fields in constant pool) // and is multiplied by (instanceKlass::next_offset) when accessing. // t = TosState (see below) // f = field is marked final (see below) // f2 = virtual but final (method entries only: is_vfinal()) // v = field is volatile (see below) // m = invokeinterface used for method in class Object (see below) // h = RedefineClasses/Hotswap bit (see below) // // The flags after TosState have the following interpretation: // bit 27: 0 for fields, 1 for methods // f flag true if field is marked final // v flag true if field is volatile (only for fields) // f2 flag true if f2 contains an oop (e.g., virtual final method) // fv flag true if invokeinterface used for method in class Object // // The flags 31, 30, 29, 28 together build a 4 bit number 0 to 8 with the // following mapping to the TosState states: // // btos: 0 // ctos: 1 // stos: 2 // itos: 3 // ltos: 4 // ftos: 5 // dtos: 6 // atos: 7 // vtos: 8 // // Entry specific: field entries: // _indices = get (b1 section) and put (b2 section) bytecodes, original constant pool index // _f1 = field holder (as a java.lang.Class, not a klassOop) // _f2 = field offset in bytes // _flags = field type information, original FieldInfo index in field holder // (field_index section) // // Entry specific: method entries: // _indices = invoke code for f1 (b1 section), invoke code for f2 (b2 section), // original constant pool index // _f1 = methodOop for non-virtual calls, unused by virtual calls. // for interface calls, which are essentially virtual but need a klass, // contains klassOop for the corresponding interface. // for invokedynamic, f1 contains a site-specific CallSite object (as an appendix) // for invokehandle, f1 contains a site-specific MethodType object (as an appendix) // (upcoming metadata changes will move the appendix to a separate array) // _f2 = vtable/itable index (or final methodOop) for virtual calls only, // unused by non-virtual. The is_vfinal flag indicates this is a // method pointer for a final method, not an index. // _flags = method type info (t section), // virtual final bit (vfinal), // parameter size (psize section) // // Note: invokevirtual & invokespecial bytecodes can share the same constant // pool entry and thus the same constant pool cache entry. All invoke // bytecodes but invokevirtual use only _f1 and the corresponding b1 // bytecode, while invokevirtual uses only _f2 and the corresponding // b2 bytecode. The value of _flags is shared for both types of entries. // // The fields are volatile so that they are stored in the order written in the // source code. The _indices field with the bytecode must be written last. class ConstantPoolCacheEntry VALUE_OBJ_CLASS_SPEC { friend class VMStructs; friend class constantPoolCacheKlass; friend class constantPoolOopDesc; //resolve_constant_at_impl => set_f1 private: volatile intx _indices; // constant pool index & rewrite bytecodes volatile oop _f1; // entry specific oop field volatile intx _f2; // entry specific int/oop field volatile intx _flags; // flags #ifdef ASSERT bool same_methodOop(oop cur_f1, oop f1); #endif void set_bytecode_1(Bytecodes::Code code); void set_bytecode_2(Bytecodes::Code code); void set_f1(oop f1) { oop existing_f1 = _f1; // read once assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change"); oop_store(&_f1, f1); } void release_set_f1(oop f1); void set_f2(intx f2) { assert(_f2 == 0 || _f2 == f2, "illegal field change"); _f2 = f2; } void set_f2_as_vfinal_method(methodOop f2) { assert(_f2 == 0 || _f2 == (intptr_t) f2, "illegal field change"); assert(is_vfinal(), "flags must be set"); _f2 = (intptr_t) f2; } int make_flags(TosState state, int option_bits, int field_index_or_method_params); void set_flags(intx flags) { _flags = flags; } bool init_flags_atomic(intx flags); void set_field_flags(TosState field_type, int option_bits, int field_index) { assert((field_index & field_index_mask) == field_index, "field_index in range"); set_flags(make_flags(field_type, option_bits | (1 << is_field_entry_shift), field_index)); } void set_method_flags(TosState return_type, int option_bits, int method_params) { assert((method_params & parameter_size_mask) == method_params, "method_params in range"); set_flags(make_flags(return_type, option_bits, method_params)); } bool init_method_flags_atomic(TosState return_type, int option_bits, int method_params) { assert((method_params & parameter_size_mask) == method_params, "method_params in range"); return init_flags_atomic(make_flags(return_type, option_bits, method_params)); } public: // specific bit definitions for the flags field: // (Note: the interpreter must use these definitions to access the CP cache.) enum { // high order bits are the TosState corresponding to field type or method return type tos_state_bits = 4, tos_state_mask = right_n_bits(tos_state_bits), tos_state_shift = BitsPerInt - tos_state_bits, // see verify_tos_state_shift below // misc. option bits; can be any bit position in [16..27] is_vfinal_shift = 21, is_volatile_shift = 22, is_final_shift = 23, has_appendix_shift = 24, is_forced_virtual_shift = 25, is_field_entry_shift = 26, // low order bits give field index (for FieldInfo) or method parameter size: field_index_bits = 16, field_index_mask = right_n_bits(field_index_bits), parameter_size_bits = 8, // subset of field_index_mask, range is 0..255 parameter_size_mask = right_n_bits(parameter_size_bits), option_bits_mask = ~(((-1) << tos_state_shift) | (field_index_mask | parameter_size_mask)) }; // specific bit definitions for the indices field: enum { main_cp_index_bits = 2*BitsPerByte, main_cp_index_mask = right_n_bits(main_cp_index_bits), bytecode_1_shift = main_cp_index_bits, bytecode_1_mask = right_n_bits(BitsPerByte), // == (u1)0xFF bytecode_2_shift = main_cp_index_bits + BitsPerByte, bytecode_2_mask = right_n_bits(BitsPerByte), // == (u1)0xFF // the secondary cp index overlaps with bytecodes 1 and 2: secondary_cp_index_shift = bytecode_1_shift, secondary_cp_index_bits = BitsPerInt - main_cp_index_bits }; // Initialization void initialize_entry(int original_index); // initialize primary entry void initialize_secondary_entry(int main_index); // initialize secondary entry void set_field( // sets entry to resolved field state Bytecodes::Code get_code, // the bytecode used for reading the field Bytecodes::Code put_code, // the bytecode used for writing the field KlassHandle field_holder, // the object/klass holding the field int orig_field_index, // the original field index in the field holder int field_offset, // the field offset in words in the field holder TosState field_type, // the (machine) field type bool is_final, // the field is final bool is_volatile // the field is volatile ); void set_method( // sets entry to resolved method entry Bytecodes::Code invoke_code, // the bytecode used for invoking the method methodHandle method, // the method/prototype if any (NULL, otherwise) int vtable_index // the vtable index if any, else negative ); void set_interface_call( methodHandle method, // Resolved method int index // Method index into interface ); void set_method_handle( methodHandle method, // adapter for invokeExact, etc. Handle appendix // stored in f1; could be a java.lang.invoke.MethodType ); void set_dynamic_call( methodHandle method, // adapter for this call site Handle appendix // stored in f1; could be a java.lang.invoke.CallSite ); // Common code for invokedynamic and MH invocations. // The "appendix" is an optional call-site-specific parameter which is // pushed by the JVM at the end of the argument list. This argument may // be a MethodType for the MH.invokes and a CallSite for an invokedynamic // instruction. However, its exact type and use depends on the Java upcall, // which simply returns a compiled LambdaForm along with any reference // that LambdaForm needs to complete the call. If the upcall returns a // null appendix, the argument is not passed at all. // // The appendix is *not* represented in the signature of the symbolic // reference for the call site, but (if present) it *is* represented in // the methodOop bound to the site. This means that static and dynamic // resolution logic needs to make slightly different assessments about the // number and types of arguments. void set_method_handle_common( Bytecodes::Code invoke_code, // _invokehandle or _invokedynamic methodHandle adapter, // invoker method (f2) Handle appendix // appendix such as CallSite, MethodType, etc. (f1) ); methodOop method_if_resolved(constantPoolHandle cpool); void set_parameter_size(int value); // Which bytecode number (1 or 2) in the index field is valid for this bytecode? // Returns -1 if neither is valid. static int bytecode_number(Bytecodes::Code code) { switch (code) { case Bytecodes::_getstatic : // fall through case Bytecodes::_getfield : // fall through case Bytecodes::_invokespecial : // fall through case Bytecodes::_invokestatic : // fall through case Bytecodes::_invokeinterface : return 1; case Bytecodes::_putstatic : // fall through case Bytecodes::_putfield : // fall through case Bytecodes::_invokehandle : // fall through case Bytecodes::_invokedynamic : // fall through case Bytecodes::_invokevirtual : return 2; default : break; } return -1; } // Has this bytecode been resolved? Only valid for invokes and get/put field/static. bool is_resolved(Bytecodes::Code code) const { switch (bytecode_number(code)) { case 1: return (bytecode_1() == code); case 2: return (bytecode_2() == code); } return false; // default: not resolved } // Accessors bool is_secondary_entry() const { return (_indices & main_cp_index_mask) == 0; } int main_entry_index() const { assert(is_secondary_entry(), "must be secondary entry"); return ((uintx)_indices >> secondary_cp_index_shift); } int primary_entry_indices() const { assert(!is_secondary_entry(), "must be main entry"); return _indices; } int constant_pool_index() const { return (primary_entry_indices() & main_cp_index_mask); } Bytecodes::Code bytecode_1() const { return Bytecodes::cast((primary_entry_indices() >> bytecode_1_shift) & bytecode_1_mask); } Bytecodes::Code bytecode_2() const { return Bytecodes::cast((primary_entry_indices() >> bytecode_2_shift) & bytecode_2_mask); } methodOop f1_as_method() const { oop f1 = _f1; assert(f1 == NULL || f1->is_method(), ""); return methodOop(f1); } klassOop f1_as_klass() const { oop f1 = _f1; assert(f1 == NULL || f1->is_klass(), ""); return klassOop(f1); } oop f1_as_klass_mirror() const { oop f1 = f1_as_instance(); return f1; } // i.e., return a java_mirror oop f1_as_instance() const { oop f1 = _f1; assert(f1 == NULL || f1->is_instance() || f1->is_array(), ""); return f1; } oop f1_appendix() const { assert(has_appendix(), ""); return f1_as_instance(); } bool is_f1_null() const { oop f1 = _f1; return f1 == NULL; } // classifies a CPC entry as unbound int f2_as_index() const { assert(!is_vfinal(), ""); return (int) _f2; } methodOop f2_as_vfinal_method() const { assert(is_vfinal(), ""); return methodOop(_f2); } int field_index() const { assert(is_field_entry(), ""); return (_flags & field_index_mask); } int parameter_size() const { assert(is_method_entry(), ""); return (_flags & parameter_size_mask); } bool is_volatile() const { return (_flags & (1 << is_volatile_shift)) != 0; } bool is_final() const { return (_flags & (1 << is_final_shift)) != 0; } bool has_appendix() const { return (_flags & (1 << has_appendix_shift)) != 0; } bool is_forced_virtual() const { return (_flags & (1 << is_forced_virtual_shift)) != 0; } bool is_vfinal() const { return (_flags & (1 << is_vfinal_shift)) != 0; } bool is_method_entry() const { return (_flags & (1 << is_field_entry_shift)) == 0; } bool is_field_entry() const { return (_flags & (1 << is_field_entry_shift)) != 0; } bool is_byte() const { return flag_state() == btos; } bool is_char() const { return flag_state() == ctos; } bool is_short() const { return flag_state() == stos; } bool is_int() const { return flag_state() == itos; } bool is_long() const { return flag_state() == ltos; } bool is_float() const { return flag_state() == ftos; } bool is_double() const { return flag_state() == dtos; } bool is_object() const { return flag_state() == atos; } TosState flag_state() const { assert((uint)number_of_states <= (uint)tos_state_mask+1, ""); return (TosState)((_flags >> tos_state_shift) & tos_state_mask); } // Code generation support static WordSize size() { return in_WordSize(sizeof(ConstantPoolCacheEntry) / HeapWordSize); } static ByteSize size_in_bytes() { return in_ByteSize(sizeof(ConstantPoolCacheEntry)); } static ByteSize indices_offset() { return byte_offset_of(ConstantPoolCacheEntry, _indices); } static ByteSize f1_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f1); } static ByteSize f2_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f2); } static ByteSize flags_offset() { return byte_offset_of(ConstantPoolCacheEntry, _flags); } // GC Support void oops_do(void f(oop*)); void oop_iterate(OopClosure* blk); void oop_iterate_m(OopClosure* blk, MemRegion mr); void follow_contents(); void adjust_pointers(); #ifndef SERIALGC // Parallel Old void follow_contents(ParCompactionManager* cm); #endif // SERIALGC void update_pointers(); // RedefineClasses() API support: // If this constantPoolCacheEntry refers to old_method then update it // to refer to new_method. // trace_name_printed is set to true if the current call has // printed the klass name so that other routines in the adjust_* // group don't print the klass name. bool adjust_method_entry(methodOop old_method, methodOop new_method, bool * trace_name_printed); bool is_interesting_method_entry(klassOop k); // Debugging & Printing void print (outputStream* st, int index) const; void verify(outputStream* st) const; static void verify_tos_state_shift() { // When shifting flags as a 32-bit int, make sure we don't need an extra mask for tos_state: assert((((u4)-1 >> tos_state_shift) & ~tos_state_mask) == 0, "no need for tos_state mask"); } }; // A constant pool cache is a runtime data structure set aside to a constant pool. The cache // holds interpreter runtime information for all field access and invoke bytecodes. The cache // is created and initialized before a class is actively used (i.e., initialized), the indivi- // dual cache entries are filled at resolution (i.e., "link") time (see also: rewriter.*). class constantPoolCacheOopDesc: public oopDesc { friend class VMStructs; private: int _length; constantPoolOop _constant_pool; // the corresponding constant pool // Sizing debug_only(friend class ClassVerifier;) public: int length() const { return _length; } private: void set_length(int length) { _length = length; } static int header_size() { return sizeof(constantPoolCacheOopDesc) / HeapWordSize; } static int object_size(int length) { return align_object_size(header_size() + length * in_words(ConstantPoolCacheEntry::size())); } int object_size() { return object_size(length()); } // Helpers constantPoolOop* constant_pool_addr() { return &_constant_pool; } ConstantPoolCacheEntry* base() const { return (ConstantPoolCacheEntry*)((address)this + in_bytes(base_offset())); } friend class constantPoolCacheKlass; friend class ConstantPoolCacheEntry; public: // Initialization void initialize(intArray& inverse_index_map); // Secondary indexes. // They must look completely different from normal indexes. // The main reason is that byte swapping is sometimes done on normal indexes. // Also, some of the CP accessors do different things for secondary indexes. // Finally, it is helpful for debugging to tell the two apart. static bool is_secondary_index(int i) { return (i < 0); } static int decode_secondary_index(int i) { assert(is_secondary_index(i), ""); return ~i; } static int encode_secondary_index(int i) { assert(!is_secondary_index(i), ""); return ~i; } // Accessors void set_constant_pool(constantPoolOop pool) { oop_store_without_check((oop*)&_constant_pool, (oop)pool); } constantPoolOop constant_pool() const { return _constant_pool; } // Fetches the entry at the given index. // The entry may be either primary or secondary. // In either case the index must not be encoded or byte-swapped in any way. ConstantPoolCacheEntry* entry_at(int i) const { assert(0 <= i && i < length(), "index out of bounds"); return base() + i; } // Fetches the secondary entry referred to by index. // The index may be a secondary index, and must not be byte-swapped. ConstantPoolCacheEntry* secondary_entry_at(int i) const { int raw_index = i; if (is_secondary_index(i)) { // correct these on the fly raw_index = decode_secondary_index(i); } assert(entry_at(raw_index)->is_secondary_entry(), "not a secondary entry"); return entry_at(raw_index); } // Given a primary or secondary index, fetch the corresponding primary entry. // Indirect through the secondary entry, if the index is encoded as a secondary index. // The index must not be byte-swapped. ConstantPoolCacheEntry* main_entry_at(int i) const { int primary_index = i; if (is_secondary_index(i)) { // run through an extra level of indirection: int raw_index = decode_secondary_index(i); primary_index = entry_at(raw_index)->main_entry_index(); } assert(!entry_at(primary_index)->is_secondary_entry(), "only one level of indirection"); return entry_at(primary_index); } // Code generation static ByteSize base_offset() { return in_ByteSize(sizeof(constantPoolCacheOopDesc)); } static ByteSize entry_offset(int raw_index) { int index = raw_index; if (is_secondary_index(raw_index)) index = decode_secondary_index(raw_index); return (base_offset() + ConstantPoolCacheEntry::size_in_bytes() * index); } // RedefineClasses() API support: // If any entry of this constantPoolCache points to any of // old_methods, replace it with the corresponding new_method. // trace_name_printed is set to true if the current call has // printed the klass name so that other routines in the adjust_* // group don't print the klass name. void adjust_method_entries(methodOop* old_methods, methodOop* new_methods, int methods_length, bool * trace_name_printed); }; #endif // SHARE_VM_OOPS_CPCACHEOOP_HPP